TWebBrowser - Hook receive event

I am trying to automatically submit a form, and save the resulting image that gets shown in the TWebBrowser object.

The image gets loaded over several chained javascript requests (ajax), until it finally appear开发者_JS百科s in the document.

What is the best way to get this image? I thought of hooking the receive function to be able to see the http response (which would basically be my image).

Another possibility could be to load the image from cache / memory...

I don't have any idea how to practically do this, I hope someone can help.

Thanks.

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you can retrieve all the url images using the images property from the IHTMLDocument2 object.

see this sample using the OnDocumentComplete Event.

procedure TForm2.WebBrowser1DocumentComplete(ASender: TObject; const pDisp: IDispatch; var URL: OleVariant);
var
HTMLDocument2: IHTMLDocument2;
i            : Integer;
Item         : IHTMLElement;
ImageUrl     : string;
begin
    HTMLDocument2 := (WebBrowser1.Document AS IHTMLDocument2);
    for i := 0 to HTMLDocument2.images.length -1 do
    begin
    Item := HTMLDocument2.images.item(i, null) As IHTMLElement;
    ImageUrl:=item.getAttribute('src',0);
     //do your stuff with the url image retrieved
    end;
end;

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You can use the OnDocumentComplete or OnNavigateComplete2 events (see the SHDocVw help) or wait for the WebBrowser to be in a ReadyState READYSTATE_COMPLETE and then read from the WebBrowser.Document.

But you can also (simpler IMO) use a TIdHTTP.Get to directly get the response stream.

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To be more scalable with your application you can directly try EmbeddedWB. It wraps IWebBrowser2 and very handy to use. Embarcadero use EmbeddedWB in their RADStudio.